Wonderful video, the essence of Scotland.

When hunting roebuck on the Dee side, I used to visit the salmon station where guys are counting the salmons swimming upstream. It wasn't very engaging, though the Royal family is fishing this river, from their castle of Balmoral on the Dee river.
Getting a salmon was clearly not a day affair, but a week affair.
I fully agree that one has first to catch a salmon.
Shooting grouse is very easy, any ghilly worth his salt can bring You to a patch teaming with grouses. One hour affair.
Shooting a stag is all about your legs and lungs. Should a spotter inform You where to go, if You can walk and remain stealthy it could be a 1-4 hour affair.

The McNab remains a tough challenge.